Šilalė Event
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The Šilalė Event was an extinction event affecting conodonts during the Přídolí, the final stage of the Silurian period.
Timing
[edit]The Šilalė Event, first identified in the Milaičiai-103 core in southwestern Lithuania, is marked by a negative carbon isotope excursion in carbonate rocks known as the Šilalė Negative Carbon Isotope Event.[1] This isotopic excursion is also known from the Jočionys-299 borehole in eastern Lithuania,[2] as well as in coeval deposits in the Appalachian Basin of North America and has also been termed the Šilalė Low.[3][4] The amplitudes of the ~405 Ka long eccentricity cycle were at their lowest point of the entire Přídolí during the Šilalė Event. The end of the Šilalė Event corresponds to the beginning of the Delotaxis detorta conodont biozone,[1] a conodont biozone once erroneously thought to have corresponded to the latest Přídolí.[5]
Effects
[edit]The Šilalė Event resulted in a decline in conodont diversity and a corresponding increase not just in the diversity of brachiopods but in their absolute abundance as well. After the event, conodont abundance surged during the interval of biotic recovery from the Šilalė mass rarity.[1]
See also
[edit]- Ireviken Event
- Lundgreni Event
- Mulde Event
- Lau Event
- Kellwasser Event
- Dasberg Event
- Hangenberg Event
References
[edit]- ^ a b c Spiridonov, Andrej; Stankevič, Robertas; Gečas, Tomas; Brazauskas, Antanas; Kaminskas, Donatas; Musteikis, Petras; Kaveckas, Tomas; Meidla, Tõnu; Bičkauskas, Giedrius; Ainsaar, Leho; Radzevičius, Sigitas (October 2020). "Ultra-high resolution multivariate record and multiscale causal analysis of Pridoli (late Silurian): Implications for global stratigraphy, turnover events, and climate-biota interactions". Gondwana Research. 86: 222–249. doi:10.1016/j.gr.2020.05.015. Retrieved 26 March 2023.
- ^ Želvys, Tomas; Brazauskas, Antanas; Spiridonov, Andrej; Balčiūnas, Mykolas; Garbaras, Andrius; Radzevičius, Sigitas (2022). "Stable carbon isotope stratigraphy of the Silurian in the Jočionys-299 borehole (eastern Lithuania)". Estonian Journal of Earth Sciences. 71 (3): 127–134. doi:10.3176/earth.2022.09. Retrieved 26 March 2023.
- ^ Oborny, Stephan C.; Cramer, Bradley D.; Brett, Carlton E.; Bancroft, Alyssa M. (15 September 2020). "Integrated Silurian conodont and carbonate carbon isotope stratigraphy of the east-central Appalachian Basin". Palaeogeography, Palaeoclimatology, Palaeoecology. 554: 1–50. doi:10.1016/j.palaeo.2020.109815.
- ^ Oborny, Stephan C.; Cramer, Bradley D.; Brett, Carlton E. (1 October 2020). "High-resolution event stratigraphy (HiRES) of the Silurian across the Cincinnati Arch (USA) through integrating conodont and carbon isotope biochemostratigraphy, with gamma-ray and sequence stratigraphy". GFF. 142 (4): 309–324. doi:10.1080/11035897.2020.1819407. Retrieved 26 March 2023.
- ^ Slavík, Ladislav; Hladil, Jindřich (1 July 2020). "Early Devonian (Lochkovian – early Emsian) bioevents and conodont response in the Prague Synform (Czech Republic)". Palaeogeography, Palaeoclimatology, Palaeoecology. 549. doi:10.1016/j.palaeo.2019.04.004.